Abstract Band structures of wurtzite GaN ($\alpha$-GaN) under strains in the region -5%—5% are calculated in a tight-binding framework. The empirical scaling rule has been used for considering the effects of hydroatatic strains. The scaling indexes are determined by fitting the deformation-potential constants with other theoretical values. The band gap at $\Gamma$ point increases with the absolute value of strains. GaN turns to be of indirect band gap when strains reach 5 %. The density of states and the imaginary part of dialectic function ($\varepsilon$2($\omega$)) are studied. Both the shape and energy position of the highest peak in the $\varepsilon$2($\omega$) spectrum successively change with the strains. The real part of dielectric/unction, refractive index and the effects of the strains on them are also shown.
Received: 20 June 1996
Revised: 16 October 1996
Accepted manuscript online:
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